Thanks Cyrus Vap!
No leaking problem then?
Been thinking about going clearomizer's way but don't have manual batt. Now if only I could find them - seems like all stocks are sold out nowadays
No leaking so far (fingers crossed!). The taste is amazing. I feel like I've been living in the dark. I guess I recognize the purity from dripping, but with dripping I'm always too lazy to have a long vaping session, so it never really settled in.
As far as my above observation WRT draw and airflow
So the absence of stuffing seems to generate a very open, airy draw, kind of like a horizontal coil carto and then some
On the Gen 2 batts, it works like dynamite, as their naturally stiffer airflow balances things out
On my V4L batts that have a more sensitive switch, it works like dynamite X 10

Its completely effortless and open
A have 2 V4L batts that have a slightly more stubborn switch, you would hardly notice it with a wow carto, cool carto, or horizontal coil unless you're super OCD about switch sensitivities and batt discrepancies like I am.
By stubborn switch, I mean it requires a
slightly harder/higher velocity drag to get it firing. Add a super open and airy clearo, and it gets a tad more stubborn. The air flow is actually a bit TOO open, and requires a hair too much 'suck'. Nothing horrible, still excellent, but inferior to both above scenarios.
I tried sanding down the clearo threads for a tighter fit, didn't fix it. I haven't yet tried to raise the battery post/clearo post, will try and report back.
All in all not a deal breaker by any means, its the difference between 8/10 and 11/10
The other thing I'm watching for like a hawk is burning juice and consequent crud on the coils. This will happen with horizontal coil cartos on anything above 3.7 Volts (e.g. Gen 1 batts from full charge to about 2 secs before they die). My guess would be it should happen on these clearos, but for whatever reason, it has not yet. Fingers crossed again!